a$)$ Write down the procedure to determine directions in a unit cell $($write only one algorithm$).$

b$)$ Find the Miller indices of the direction shown in the unit cell.

c$)$ Draw $\frac{01}{b}ar(1),$ and $\frac{2}{b}ar(2)1$ in the given empty unit cell. Show all the steps followed to draw the

directions. Use the RH rule for XYZ axis notation.